An air alert was declared on Thursday afternoon in Lithuania’s northeastern Utena district bordering Belarus and Latvia due to potential drones entering the country's airspace.

The radar signatures showed objects "moving north from Pabradė" some 50 km north of Vilnius and that "there could be two drones", head of the country's National Crisis Management Centre (NKVC), Vilmantas Vitkauskas, told LRT RADIO.

The objects most likely entered from Belarus, he added.

Air raid sirens have rung out in the affected areas, with residents being told to proceed to shelters until further announcements.NATO jets stationed in the Baltic states as part of the air policing mission were activated, authorities said.

While the warning is currently limited to the Utena region, it could be extended to other districts, according to the Fire and Rescue Department (PAGD).